Middlesbrough are understood to be one of the 11 Championship clubs who have written to the EFL on the back of Marcelo Bielsa's spying admissions at his Leeds United press conference this week.

Boro are demanding full disclosure as Bielsa and Leeds are investigated over the spygate row.

The EFL and the FA have both already launched an investigation on the back of a formal complaint from Derby County, who discovered a member of staff from Leeds spying on their training session ahead of the Championship game between the sides last week.

But what is understood to have prompted this response from almost half of the clubs in the division is Bielsa's 66-minute press conference this week, in which he admitted to have watched training sessions of every single one of Leeds' opponents this season.

There was disappointment around the division at Bielsa's failure to apologise for his actions, and it's been put to the EFL that the Argentinian has breached a code of conduct between clubs.

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He said: "The FA, Leeds, Bielsa have all got to stand up and decide what will happen. It will be interesting to see what happens because Shaun Harvey, who was at Leeds, is now at the Football League, so let's see how that spins. It'll be an interesting couple of weeks."